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SMH4811 数据表(PDF) 3 Page - Summit Microelectronics, Inc. |
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SMH4811 数据表(HTML) 3 Page - Summit Microelectronics, Inc. |
3 / 16 page 3 2044 6.1 2/8/01 SMH4811A SUMMIT MICROELECTRONICS, Inc. Preliminary PIN DESCRIPTIONS DRAIN SENSE (1) The DRAIN SENSE input monitors the voltage at the drain of the external power MOSFET switch with respect to VSS. An internal 10µA source pulls the DRAIN SENSE signal towards the 5V reference level. DRAIN SENSE must be held below 2.5V to enable the PG outputs. VGATE (2) The VGATE output activates an external power MOSFET switch. This signal supplies a constant current output (100µA typical), which allows easy adjustment of the MOSFET turn on slew rate. EN/TS (3) The Enable/Temperature Sense input is the master en- able input. If EN/TS is less than 2.5V, VGATE will be disabled. This pin has an internal 200k Ω pull-up to 5V. PD1# and PD2# (4 & 5) These are logic level active low inputs that can optionally be employed to enable VGATE and the PG outputs when they are at VSS. These pins each have an internal 50k Ω pull-up to 5V. FAULT# (6) This is an open-drain, active-low output that indicates the fault status of the device. CBSENSE (7) The circuit breaker sense input is used to detect over- current conditions across an external, low value sense resistor (RS) tied in series with the Power MOSFET. A voltage drop of greater than 50mV across the resistor for longer than tCBD will trip the circuit breaker. A program- mable Quick-Trip™ sense point is also available. UV (9) The UV pin is used as an under-voltage supply monitor, typically in conjunction with an external resistor ladder. VGATE will be disabled if UV is less than 2.5V. Program- mable internal hysteresis is available on the UV input, adjustable in increments of 62.5mV. Also available is a filter delay on the UV input. OV (10) The OV pin is used as an over-voltage supply monitor, typically in conjunction with an external resistor ladder. VGATE will be disabled if OV is greater than 2.5V. A filter delay is available on the OV input. 5.0VREF & 2.5VREF (11 & 12) These are precision 5V and 2.5V output reference volt- ages that may be use to expand the logic input functions on the SMH4803A. The reference outputs are with re- spect to VSS. ENPG (14) This is an active high input that controls the PG# output. When ENPG is pulled low the PG# output is immediately placed in a high impedance state. This pin has an internal 50k Ω pull-up to 5V. PG# (15) The PG# pin is an open-drain, active-low output with no internal pull-up resistor. It can be used to switch a load or enable a DC/DC converter. PG# is enabled immediately after VGATE reaches VDD – VGT and the DRAIN SENSE voltage is less than 2.5V. Voltage on these pins cannot exceed 12V, as referenced to VSS. VDD (16) VDD is the positive supply connection. An internal shunt regulator limits the voltage on this pin to approximately 12V with respect to VSS. A resistor must be placed in series with the VDD pin to limit the regulator current (RD in the application illustrations). VSS (8) VSS is connected to the negative side of the supply. |
类似零件编号 - SMH4811 |
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类似说明 - SMH4811 |
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